Solving exercises on pages 116 and 117 of Math 3 Workbook Volume 1, Connect Knowledge with Life book

Solving Grade 3 Mathematics exercises on pages 116 and 117 of Connect Knowledge with Life book

Detailed solutions to exercises on pages 116 and 117 of Math 3 Workbook Volume 1, Connect Knowledge with Life book

Numerical Expressions Review

Practice Set 1

1. Solve Exercise 1 Page 116 Mathematics Grade 3

Problem: Calculate the value of the expression.
a) 731 - 680 + 19                       b) 63 x 2 : 7
c) 14 x 6 - 29                              d) 348 + 84 : 6

Solution Guide: If the expression involves only addition, subtraction, or only multiplication, division, perform the operations from left to right.

Answer:
a) 731 - 680 + 19 = 51 + 19
                             = 70
b) 63 x 2 : 7 = 126 : 7
                    = 18
c) 14 x 6 - 29 = 84 - 29
                      = 55
d) 348 + 84 : 6 = 348 + 14
                        = 362

2. Solve Exercise 2 Page 116 Mathematics Grade 3

Problem: Each bag of rice weighs 30 kg, each bag of corn weighs 45 kg. How many kilograms do 3 bags of rice and 1 bag of corn weigh?

Solution Guide:
Step 1: Calculate the weight of 3 bags of rice = Weight of one bag of rice x 3.
Step 2: Calculate the weight of 3 bags of rice and 1 bag of corn = Weight of 3 bags of rice + Weight of 1 bag of corn.

Answer:
The weight of 3 bags of rice is:
                30 x 3 = 90 (kg)
The weight of 3 bags of rice and 1 bag of corn is:
                 90 + 45 = 135 (kg)
                                    Answer: 135 kg

3. Solve Exercise 3 Page 116 Mathematics Grade 3

Problem: Which of the following expressions have values greater than 80?

Solution:
Step 1: Calculate the expression using + and - signs mentally.
Step 2: Fill in the appropriate sign so that the expression equals 5.

Solution:
We fill it in as follows:

Alternatively

Practice 2

1. Solve Exercise 1 on Page 117 of Math Textbook for Grade 3

Problem: Calculate the value of the expression.
a) 182 - (96 - 54)
b) 7 x (48 : 6)

Solution: If there are parentheses in the expression, perform the operations inside the parentheses first.

Answers:
a) 182 - (96 - 54) = 182 - 42
                             = 140
b) 7 x (48 : 6) = 7 x 8
                       = 56

2. Solve Exercise 2 on Page 117 of Math Textbook for Grade 3

Problem: Choose the number that is the value of each expression below:

Solution:
Calculate the value of each expression:
- If there are parentheses in the expression, perform the operations inside the parentheses first.
- If there are addition, subtraction, multiplication, or division operations in the expression, perform multiplication and division first, then perform addition and subtraction.

Answers:
4 x (54 - 44) = 4 x 10
                    = 40
(33 + 67) : 2 = 100 : 2
                     = 50
(25 + 45) x 3 = 70 x 3
                      = 210
52 + 24 x 2 = 52 + 48
                    = 100

We choose as follows:

3. Solve Exercise 3 on Page 117 of Math Textbook for Grade 3

Problem: Calculate the value of the expression:

Solution:
Step 1: Group two numbers whose sum or product is a multiple of ten or hundred.
Step 2: Perform operations inside parentheses first.

Answers:
a) 27 + 34 + 66 = 27 + (34 + 66)
                          = 27 + 100
                           = 127
b) 7 x 5 x 2 = 7 x (5 x 2)
                   = 7 x 10
                    = 70

4. Solve Exercise 4 on Page 117 of Math Textbook for Grade 3

Problem: Someone packs 288 car wheels into boxes, with 4 wheels in each box. Then they pack the boxes into crates, with 8 boxes in each crate. How many crates of car wheels are packed in this way?

Instructions: Calculate mentally and choose the symbol +, -, x, ÷ to form the expression with the smallest value.

Answer:

The expression has the smallest value of 0 when we use the subtraction symbol.

Solve exercises on pages 116, 117 Mathematics Grade 3 Workbook 1, the book Connecting Knowledge with Life, here, surely you have figured out how to approach the exercises, can confidently solve problems related to numerical expressions.